Receiving-instrument for telegraphy



(No Model.)

W. M. MINER. RECEIVING INSTRUMENT FOR TELEGRAPHY.

No. 437,930. Patented Oct. '7, 1890.

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NVILLARD MORSE MINER, OF PLAINFIELD, ASSIGNOR TO JAMES M. SEY- MOUR, OF BRICK CHURCH, NElV JERSEY.

RECEIVING-INSTRUMENT FOR TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 437,930, dated October 7, 1890.

Application filed May 28, 1890.

T0 aZZ whom it may concern.-

Be it known that I, W ILLARD MORSE MINER, a citizen of the United States, residing atPlainfield, county of Union, State of New Jersey, have made a new and useful Invention in Receiving-Instruments for Telegraphy, of which the following is a specification.

My invention relates particularly to an improvementin electromagnetic telegraphic receivers or relays; and its object is to provide a receiver or relay of this type which shall be exceedingly sensitive in its operation; and to this end it consists in the apparatus hereinafter described, but more particularly pointed out in the claims which follow the specification.

In the use of multiplex synchronous telegraphs it is a well-known fact that current impulses are transmitted to receiving-instruments in rapid succession, and that their effect upon such receiving-instrun1ents is not as certain as in the case where electrical currents are of a continuous nature, as is the case in ordinary Morse circuits that is to say,with relays or receiving-instruments of the ordinary type, where the electric currents are of a varying nature, due to the synchronous rotation of the trailing arms, there is more or less chatter between the contact-points of the receiving-instruments. My improvement is designed to overcome this objectionable feature, and while it is especially applicable to telegraphic systems of the type referred to I do not wish to be understood as limiting its use to that end, although I have illustrated, and shall hereinafter describe, the device in connection with that specific form of appa ratus.

The accompanying drawing represents the relay and operative circuits at a sending and receiving station.

In the drawing, ML represents a main line connected at each end to the spindle of a revolving trailing brush which passes over the segments of a distributing-commutator, a portion of which is shown at each end of the line,

. one set of receiving apparatus being drawn in detail at each end, and the brush at each end of the line, as shown, connecting these Serial No. 353,484. (No model.)

corresponding sets through the segments and the trailer.

An open circuit .is preferably used, and the operator at station Y is represented as sending, while the operator at station X is at the same time receiving. The circuit from earth E at station Y is as follows: through the line, battery B key K segment a, trailer T main line ML, trailer T, segment a, back contact of key K, polarized relay P to earth at E, thus completing the circuit.

As the sending-key K is on its front contact the receiving-instruments at this end of the line are out of circuit and those at the other end are operative. Referring then to the receiving-instruments at X, they consist of a polarized relay P and a sounder D, which latter is arranged to read on its back contact 5. The line-circuit goes through the coils of the polarized relay in the ordinary way and then to earth, and there is but one difference between the connections which are ordinarily used for such instruments and those which are here shown. It consists in a local battery b having one pole connected to the main-line circuit at the point 9 between the two relay-coils,and the other pole at the point 7, thus making an independent local circuit through one coil of the polarized relayand an adjustable rheostat Rh.

This device causes the polarized relay to respond to an intermittent current of one polarity, instead of reversed currents, as usual.

The arrows on the main line indicate the action of the current from the battery B at Y. The current from the local battery 12 at X is indicated by the double arrows, and is opposed in direction to the current from the main line, which causes the polarized relay to act as a neutral relay.

The armature is normally against the contact-stop 1 under the action of the polarity caused by the current from the battery 19 The line-current from Y opposes this action, and the armature by its normal polarity is drawn against the contact-point 3, opening the circuit of the battery I) and releasing the armature of the sounder D, which is normally held down on closed circuit, as is shown in the set of instruments at Y, this set operating in a similar manner when the key at X is closed.

It Will be observed that similar parts at each end of the line are indicated by the same letters-that is, those at X havingodd numbers and those at Y having even numbers.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. A telegraphic receiving-instrument consisting of an electro-magnet having its coils included in a main-line or charging circuit, in combination with a local battery connected to the opposite ends of one of said coils, so that its current flow opposes the charge-current; substantially as described.

2. A telegraphic receiving-relay having its coils both located in a normally-open mainline circuit provided with a charging-battery, one of said coils including a permanentlyclosed local circuit which opposes the effect of the charging-battery, in combination with a local sounder included in a local circuit passing through a polarized armature located between the poles of the relay, substantially as described andshown.

3. A polar relay having its coils included in a normally-open main or charging line, one of said coils including a local-battery circuit which normally tends to keep the local or sounder circuit closed, and opposes the effect of the charging-battery when put to line, substantially as described.

4. In a telegraph system, two polar relays normally included in a main line, two mainline batteries normally out of action, two local batteries, one for each relay and each permanently in circuit with one coil of its own relay, said local batteries having the direction of current flow through said relays opposite in direction to that of the distant main-line battery when put to line, substantially as described.

' 5. In a telegraph system, two polar relays included in a main line through the back stops of two transmitting-keys, one for each distant relay, two main-line batteries normally out of action but connected with like poles to the front stops of the aforesaid keys, two local batteries permanently closed each through one of the coils of its own relay, the direction of current flow being opposite to that of the distant main-line battery connected to line with polar armatures and local-circuit and sounder connections, substantially as described. v

\VILLARD MORSE MINER.

l/Vitnessesz GEO. H. STAYNER, J r., FRANCIS JAMES PATTEN. 

